One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,9,8)(7,11,12,10)(13,14)(15,25)(16,22)(17,23)(18,24)(19,21)(20,26)(27,28)(5,7,9,12)(6,10,8,11)(13,15,19,26)(14,20,21,25)(16,17,24,27)(18,23,22,28)(1,2,3,4)(5,6,9,8)(7,10,12,11)(14,21)(15,26)(16,24)(23,28)(1,2)(3,4)(13,16,19,24)(14,22,21,18)(15,17,26,27)(20,28,25,23)(5,8,9,6)(7,11,12,10)(13,17)(14,23)(15,24)(16,26)(18,25)(19,27)(20,22)(21,28)(13,18,19,22)(14,24,21,16)(15,23,26,28)(17,20,27,25)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.